SHS M4/M16 Gearbox Reinforcement

Gearbox reinforcement manufactured by SHS that fills the empty space around the hop-up unit, thus supporting the weak front end of the gearbox and strengthening it against breakage. Similar product to AirsoftPro's Mblock.

The part holds even a broken mech firmly in place and allows the weapon to continue to function. Suitable for most common ver.2 M4/M16 models. Not suitable for use with two-piece hop up units.